Can I use any release of the Oracle Pro*C or Pro*C/C++ Precompiler with any version of the Oracle Server?
No. You can use an older version of Pro*C or Pro*C/C++ with a newer version of the server, but you cannot use a newer version of Pro*C or Pro*C/C++ with an older version of the server. For example, you can use release 1.4 of Pro*C with Oracle7, but you cannot use Pro*C/C++ release 2.1 with the Oracle version 6 server.
No. You can use an older version of Pro*C or Pro*C/C++ with a newer version of the server, but you cannot use a newer version of Pro*C/C++ with an older version of the server. For example, you can use release 2.2 of Pro*C/C++ with Oracle8, but you cannot use Pro*C/C++ release8.0 with the Oracle7 server.